Probably a really dumb question...but could you buy some of these and bring home to drink at a later date?

I'd prefer to drink something like BBB in the comfort of my own home. I love a good RIS but not sure that a beer festival is the best place to enjoy it (unless someone is willing to bring me an armchair...)

If I recall, the RDS doesn't permit take-away sales, presumably because they don't want anyone with glass in their hands at any point. If I also recall correctly, beer does get sold in bottles irrespective of the rules, so ¯\_(ツ)_/¯. Don't expect takeaway beer to be advertised, but ask nicely and see what happens, I guess.